参数资料
型号: NCP1397BDR2G
厂商: ON Semiconductor
文件页数: 18/27页
文件大小: 0K
描述: IC REG CTRLR ISO PWM 16-SOIC
标准包装: 2,500
PWM 型: 控制器
输出数: 1
频率 - 最大: 560kHz
占空比: 52%
电源电压: 10.3 V ~ 20 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 16-SOIC(0.154",3.90mm 宽)15 引线
包装: 带卷 (TR)
NCP1397A, NCP1397B
4.00
3.00
2.00
1.00
0
16.0
Ct Voltage
12.0
8.00
4.00
0
8.00
4.00
0
? 4.00
? 8.00
A ? B
Clock Pulses
DT
DT
DT
56.2 m
65.9 m
75.7 m
85.4 m
95.1 m
time in seconds
Figure 39. Typical Oscillator Waveforms
Brown ? Out protection
The Brown ? Out circuitry (BO) offers a way to protect the
resonant converter from low DC input voltages. Below a
given level, the controller blocks the output pulses, above it,
Vbulk
Rupper
IBO
V DD
ON/OFF
it authorizes them. The internal circuitry, depicted by
Figure 40, offers a way to observe the high ? voltage (HV)
rail. A resistive divider made of R upper and R lower , brings a
portion of the HV rail on Pin 5. Below the turn ? on level, the
28 m A current source IBO is off. Therefore, the turn ? on
level solely depends on the division ratio brought by the
Rlower
BO
+
+
?
VBO
BO
resistive divider.
Figure 40. The Internal Brown ? out Configuration with
an Offset Current Source
http://onsemi.com
18
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